In this comment, the OP said he was also wondering about the blessing of tithing and temple ceremonies in general. That would make this question border on asking three separate questions, but I'll give it a shot. (I'll only explain the blessings of tithing and temple ceremonies in particular, since the blessing of the celestial kingdom have been pretty well covered in the other answers).
One of the blessing of tithing is that you get to materially contribute to the Kingdom of the Lord (PMG Lesson 4). The funds are used in a way directed by the Lord, so tithes are essentially owned by the Lord, which He uses to advance His work. Tithing are not used to pay Church leaders, most work in the Church is volunteer. (I think people like construction workers are paid. I'm not sure who else.) (A follow up question you might have is why people volunteer to do free service in the Church.)
Another blessing is that the Lord pour out His blessings. In Malachi 3:10-12 we read:
10 Bring ye all the tithes into the storehouse, that there may be meat
in mine house, and prove me now herewith, saith the Lord of hosts, if
I will not open you the windows of heaven, and pour you out a
blessing, that there shall not be room enough to receive it.
11 And I will rebuke the devourer for your sakes, and he shall not
destroy the fruits of your ground; neither shall your vine cast her
fruit before the time in the field, saith the Lord of hosts.
12 And all nations shall call you blessed: for ye shall be a
delightsome land, saith the Lord of hosts.
(see also 3 Nephi 24:10-12).
Indeed "faithful tithe payers learn that they cannot afford not to pay tithing" (True to the Faith). Some quotes from modern Church leaders illustrating the principle
During World War II, my widowed mother supported her three young
children on a schoolteacher’s salary that was meager. When I became
conscious that we went without some desirable things because we didn’t
have enough money, I asked my mother why she paid so much of her
salary as tithing. I have never forgotten her explanation: “Dallin,
there might be some people who can get along without paying tithing,
but we can’t. The Lord has chosen to take your father and leave me to
raise you children. I cannot do that without the blessings of the
Lord, and I obtain those blessings by paying an honest tithing. When I
pay my tithing, I have the Lord’s promise that he will bless us, and
we must have those blessings if we are to get along.” (Tithing by Elder Dallin H. Oaks, April 1994 General Conference)
After some events related to a civil war in Central America, my
father’s business went bankrupt. He went from about 200 full-time
employees to fewer than five sewing operators who worked as needed in
the garage of our home. One day during those difficult times, I heard
my parents discussing whether they should pay tithing or buy food for
On Sunday, I followed my father to see what he was going to do. After
our Church meetings, I saw him take an envelope and put his tithing in
it. That was only part of the lesson. The question that remained for
me was what we were going to eat.
Early Monday morning, some people knocked on our door. When I opened
it, they asked for my father. I called for him, and when he arrived,
the visitors told him about an urgent sewing order they needed as
quickly as possible. They told him that the order was so urgent that
they would pay for it in advance. That day I learned the principles of
paying tithing and the blessings that follow. (The Language of the Gospel by Elder Valeri V. Cordón, April 2017 General Conference)
Another blessing of Tithing is that it prepares us for the ordinances in the temple.
Blessing of Temples
There are many blessings associated with the temple. One blessing that you receive from simply going to the temple is peace
As I think of temples, my thoughts turn to the many blessings we
receive therein. As we enter through the doors of the temple, we leave
behind us the distractions and confusion of the world. Inside this
sacred sanctuary, we find beauty and order. There is rest for our
souls and a respite from the cares of our lives. (Blessings of the Temple by President Thomas S. Monson, April 2015 General Conference).
You can also receive spiritual guidance (True to the Faith, Blessings from Attending the Temples).
The ordinances in the temples also give blessings. Also from True to the Faith, we read
One ordinance we receive in the temple is the endowment. The word
endowment means “gift,” and the temple endowment truly is a gift from
God. The ordinance consists of a series of instructions and includes
covenants we make to live righteously and comply with the requirements
of the gospel. The endowment helps us focus on the Savior, His role in
our Heavenly Father’s plan, and our commitment to follow Him.
Another temple ordinance is celestial marriage, in which husband and
wife are sealed to one another for eternity. A sealing performed in
the temple continues forever if the husband and wife are faithful to
the covenants they make.
Children born to parents who have been sealed in the temple are born
in the covenant. These children automatically become part of an
eternal family. Children who are not born in the covenant can also
become part of an eternal family once their natural or adoptive
parents have been sealed to one another. The ordinance of sealing
children to parents is performed in the temple.
We can also perform ordinances on behalf of our ancestors, allowing them to receive the blessings associated with them.